I've got the fancy watercolor stretching boards (http://www.dickblick.com/products/guerrilla-painter-watercolorboard/), and the problem is the deep rippled indent that the beveled edges make in the paper. It can't be dealt with well in matting. B
Those fancy watercolor stretching boards look kinda cool. I've never used one. Let us know, if you get them.
Linda M. Feltner Artist, LLC
P.O. Box 325
Hereford, AZ 85615